Root access for Android 4.4 injecting su

lsusb

sudo apt install android-tools-adb

adb devices

adb pull / /$HOME/Videos

adb shell

Decompile and extract su

apktool d eu.chainfire.supersu-2.46-246-minAPI7.apk

cp supersu.armv7.png su

chmod 755 su

file su

cp ramdisk /home/user/ramdisk_su

cp su ramdisk_su/sbin

mv su ramdisk_su/sbin/su

cd sbin

chmod 6755 su

chown root:root su

Creat symlink>>>

ln -s su sh

sudo chown -h root:root sh

ls -al

lrwxrwxrwx 1 root root      2 Jan  3 18:01 sh -> su

-rwsr-sr-x 1 root root  75364 Jan  3 16:35 su

boot.img root

cp sbin/daemonsu system/xbin/daemonsu

cp sbin/su system/xbin/su

chown root:root system/xbin/su

chmod 6755 system/xbin/su

chown root:root system/xbin/daemonsu

chmod 755 system/xbin/daemonsu

ramdisk/system/xbin$ ls -al

total 160

drwxrwxr-x 2 user user  4096 Jan  4 14:18 .

drwxrwxr-x 3 user user  4096 Jan  4 14:51 ..

-rwxr-xr-x 1 root root 75364 Jan  4 14:18 daemonsu

-rwsr-sr-x 1 root root 75364 Jan  4 14:17 su

nano default.prop

ro.secure=0

ro.allow.mock.location=0

persist.mtk.aee.aed=on

ro.debuggable=1

ro.adb.secure=0

persist.sys.usb.config=adb

persist.service.acm.enable=0

ro.mount.fs=EXT4

ro.persist.partition.support=no

init.debug=1

adb devices

adb shell reboot -p

    a kernel-level power-off

./flash_tool

1 - choose boot.img and Download.

2 - plug USB cable into phone.

system.img root

sudo mount -o loop /media/.../SYS15_ANDROID_system.img /mnt/android/

SYS09_BOOTIMG_boot/ramdisk/system/xbin$ cp daemonsu /mnt/android/xbin/

SYS09_BOOTIMG_boot/ramdisk/system/xbin$ cp su /mnt/android/xbin/

sudo chown root:root /mnt/android/xbin/su

sudo chmod 6755 /mnt/android/xbin/su

sudo chown root:root /mnt/android/xbin/daemonsu

sudo chmod 755 /mnt/android/xbin/daemonsu

/mnt/android/xbin$ ls -al

total 932

drwxr-xr-x.  2 root 2000   4096 Jan  4 16:52 .

drwxr-xr-x. 18 root root   4096 Jan  1  1970 ..

-rwxr-xr-x.  1 root 2000  17912 Sep 20  2014 BGW

-rwxr-xr-x   1 root root  75364 Jan  4 16:52 daemonsu

-rwxr-xr-x.  1 root 2000  59752 Sep 20  2014 dexdump

-rwxr-xr-x.  1 root 2000  34572 Sep 20  2014 libmnlp_mt6572

-rwxr-xr-x.  1 root 2000  30196 Sep 20  2014 mnld

-rwxr-xr-x.  1 root 2000   9440 Sep 20  2014 showmap

-rwsr-sr-x   1 root root  75364 Jan  4 16:51 su

-rwxr-xr-x.  1 root root 624204 Sep 20  2014 tcpdump

sudo umount /mnt/android

sudo ./flash_tool